-17.77% is the change from 619 to 509
Calculation steps:
[( 509 - 619 ) ÷ 619] x 100 = -17.77%
Formula
Percentage change = [(509 - 619) / 619] x 100
Subtract the new number by the original number
509 - 619 = -110
-110 ÷ 619 = -0.1777059773828756
-0.1777059773828756 x 100 = -17.77%